Method for Adjusting a Leg Prosthesis and Verifying the Adjustment, and Apparatus for the Measurement of Forces or Moments in a Leg Prosthesis
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Accused Products
Abstract
The invention relates to a method for verifying the adjustment of a prosthetic knee joint that connects a lower leg shaft, to which a prosthetic foot can be fastened, to an upper leg shaft in a manner allowing the lower leg shaft to rotate about a joint axis in order for the prosthetic knee joint to be fastened to an end of the upper leg, the upper leg shaft being movable relative to the joint axis. A knee moment and an axial force that is effective in the lower leg shaft are measured via sensors when the prosthesis is utilized. A resulting force vector with a point of attack on the upper leg shaft is calculated from said variables. The horizontal distance and the position of the resulting force vector relative to the joint axis are also calculated, and a verification is made whether and by how much the resulting force vector lies in front of or behind the joint axis on the sagittal plane. The invention also relates to an apparatus especially for carrying out the inventive method, in which connecting means are mounted on an upper prosthetic joint part so as to be movable on the sagittal plane between said upper part and an upper leg shaft while devices for detecting knee forces or moments are mounted on a terminal adapter or the upper part.
44 Citations
53 Claims
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1-26. -26. (canceled)
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27. A method for verifying the adjustment of a leg prosthesis, wherein the leg prosthesis includes a prosthetic knee joint pivotally connected to an upper connection and a lower leg shaft, wherein the upper connection fixes the leg prosthesis on a user of the leg prosthesis and the lower leg shaft fastens to a prosthetic foot, and wherein the upper connection is displaceable in relation to a joint axis of the prosthetic knee joint, the method comprising:
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measuring a knee moment and an axial force by means of sensors when the leg prosthesis is being used; calculating a resultant force vector using the knee moment and the axial force; calculating a normal distance relative to the joint axis and the position of the resultant force vector in relation to the joint axis; and verifying a position of the resultant force vector relative to the joint axis in the sagittal plane. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method for adjusting a leg prosthesis having a prosthetic knee joint pivotally connecting an upper connection for fixing the leg prosthesis on a prosthesis user and a lower leg shaft to which a prosthetic foot is fastened, wherein the upper connection is displaceable in relation to a joint axis of the prosthetic knee joint and/or the position of the prosthetic foot in relation to the lower leg shaft, the method comprising:
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measuring a knee moment and an axial force by means of sensors when the prosthesis is being used; calculating a resultant force vector using the knee moment and the axial force; calculating a normal distance in relation to the joint axis and the position of the resultant force vector in relation to the joint axis; verifying a position of the resultant force vector relative to the joint axis in a sagittal plane; and adjusting the upper connection in relation to an axis of the prosthetic knee joint and/or extension stops for the prosthetic knee joint and/or a prosthetic foot joint based on the position of the resultant force vector. - View Dependent Claims (45)
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46. An apparatus for measuring forces or moments in a leg prosthesis having a prosthetic joint comprising:
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an upper part connectable to an upper connection for fastening to a user of the prosthesis; a lower part jointly connected to the upper part; connecting means for fastening the upper part to the upper connection; and means for detecting knee forces and moments provided on one of the connecting means and the upper part. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53)
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Specification